Vulnerability · Published Jul 30, 2026 · Assigned by GitHub_M
CVE-2026-55777GoAccess: Out-of-bounds heap read in parse_ios() via crafted User-Agent leads to remote crash/DoS
Medium 5.3
In plain English
A medium-severity out-of-bounds read in goaccess from allinurl. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
GoAccess is a real-time web log analyzer and interactive viewer that runs in a terminal in *nix systems or through the browser. Prior to 1.11, the parse_ios() function uses an attacker-controlled keyword-to-OS offset as both the source offset and copy length for memmove, allowing a crafted User-Agent in a processed access log to read up to approximately 4 KB beyond the heap allocation and conditionally crash GoAccess. This issue is fixed in version 1.11.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | goaccess | no fix listed | DEBIAN-CVE-2026-55777 |
| Debian:13 | goaccess | 1:1.9.3-1+deb13u1 | DEBIAN-CVE-2026-55777 |
| Debian:14 | goaccess | 1:1.11-1 | DEBIAN-CVE-2026-55777 |
| Ubuntu:22.04:LTS | goaccess | no fix listed | UBUNTU-CVE-2026-55777 |
| Ubuntu:24.04:LTS | goaccess | no fix listed | UBUNTU-CVE-2026-55777 |
| Ubuntu:26.04:LTS | goaccess | no fix listed | UBUNTU-CVE-2026-55777 |
| Ubuntu:26.10 | goaccess | no fix listed | UBUNTU-CVE-2026-55777 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N